46 lines
1.5 KiB
Rust
46 lines
1.5 KiB
Rust
#[macro_use]
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extern crate approx;
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extern crate nalgebra as na;
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use na::{Matrix4, Point3, Vector3};
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fn main() {
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// Create a uniform scaling matrix with scaling factor 2.
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let mut m = Matrix4::new_scaling(2.0);
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assert_eq!(m.transform_vector(&Vector3::x()), Vector3::x() * 2.0);
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assert_eq!(m.transform_vector(&Vector3::y()), Vector3::y() * 2.0);
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assert_eq!(m.transform_vector(&Vector3::z()), Vector3::z() * 2.0);
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// Append a nonuniform scaling in-place.
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m.append_nonuniform_scaling_mut(&Vector3::new(1.0, 2.0, 3.0));
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assert_eq!(m.transform_vector(&Vector3::x()), Vector3::x() * 2.0);
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assert_eq!(m.transform_vector(&Vector3::y()), Vector3::y() * 4.0);
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assert_eq!(m.transform_vector(&Vector3::z()), Vector3::z() * 6.0);
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// Append a translation out-of-place.
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let m2 = m.append_translation(&Vector3::new(42.0, 0.0, 0.0));
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assert_eq!(
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m2.transform_point(&Point3::new(1.0, 1.0, 1.0)),
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Point3::new(42.0 + 2.0, 4.0, 6.0)
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);
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// Create rotation.
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let rot = Matrix4::from_scaled_axis(&Vector3::x() * 3.14);
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let rot_then_m = m * rot; // Right-multiplication is equivalent to prepending `rot` to `m`.
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let m_then_rot = rot * m; // Left-multiplication is equivalent to appending `rot` to `m`.
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let pt = Point3::new(1.0, 2.0, 3.0);
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assert_relative_eq!(
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m.transform_point(&rot.transform_point(&pt)),
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rot_then_m.transform_point(&pt)
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);
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assert_relative_eq!(
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rot.transform_point(&m.transform_point(&pt)),
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m_then_rot.transform_point(&pt)
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);
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}
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